This book constitutes the refereed proceedings of the 30th Annual International Conference on the Theory and Applications of Cryptographic Techniques, EUROCRYPT 2011, held in Tallinn, Estonia, in May 2011. The 31 papers, presented together with 2 invited talks, were carefully reviewed and selected from 167 submissions. The papers are organized in topical sections on lattice-base cryptography, implementation and side channels, homomorphic cryptography, signature schemes, information-theoretic cryptography, symmetric key cryptography, attacks and algorithms, secure computation, composability, key dependent message security, and public key encryption.

The ninth in the series of IMA Conferences on Cryptography and Coding was held (as ever) at the Royal Agricultural College, Cirencester, from 16-18 Dec- ber 2003. The conference's varied programme of 4 invited and 25 contributed papers is represented in this volume. The contributed papers were selected from the 49 submissions using a - reful refereeing process. The contributed and invited papers are grouped into 5 topics: coding and applications; applications of coding in cryptography; cryp- graphy; cryptanalysis; and network security and protocols. These topic headings represent the breadth of activity in the areas of coding, cryptography and c- munications, and the rich interplay between these areas. Assemblingtheconferenceprogrammeandthisproceedingsrequiredthehelp of many individuals. I would like to record my appreciation of them here. Firstly, I would like to thank the programme committee who aided me - mensely by evaluating the submissions, providing detailed written feedback for the authors of many of the papers, and advising me at many critical points - ring the process. Their help and cooperation was essential, especially in view of the short amount of time available to conduct the reviewing task. The c- mittee this year consisted of Mike Darnell, Mick Ganley, Bahram Honary, Chris Mitchell, Matthew Parker, Nigel Smart and Mike Walker.

This book constitutes the refereed proceedings of the Cryptographer's Track at the RSA Conference 2021, CT-RSA 2021, held in San Francisco, CA, USA, in May 2021.*The 27 full papers presented in this volume were carefully reviewed and selected from 100 submissions. CT-RSA is the track devoted to scientific papers on cryptography, public-key to symmetric-key cryptography and from crypto-graphic protocols to primitives and their implementation security. *The conference was held virtually.

This book contains revised selected papers from the 26th International Conference on Selected Areas in Cryptography, SAC 2019, held in Waterloo, ON, Canada, in August 2019. The 26 full papers presented in this volume were carefully reviewed and selected from 74 submissions. They cover the following research areas: Design and analysis of symmetric key primitives and cryptosystems, including block and stream ciphers, hash functions, MAC algorithms, and authenticated encryption schemes, efficient implementations of symmetric and public key algorithms, mathematical and algorithmic aspects of applied cryptology, cryptography for the Internet of Things.